自适应电流保护的相关研究

A Study of Adaptive Current Protection

根据传统电流速断保护的原理,得到了不同电流保护接线方式下,传统电流速断保护的保护范围.当采用两相电流差接线方式时,保护范围与短路类型和短路相别有关.提出了根据系统运行方式、短路类型、短路相别和接线方式自动调整动作电流的方法,从而使得电流速断保护范围与短路类型、相别和接线方式无关,并举例说明了这种自适应电流速断保护的效果.针对双回线运行线路的过电流保护,提出了根据双回线路运行状态自动调整起动电流的方法,该方法提高了保护的灵敏度,且容易实现.

The protection range of traditional fast tripping current in different connection modes can be decided according to the fast tripping current protection theory. The protect range is relational to short circuit type and phase when phase differential current connection mode is adopted. Adaptive fast tripping current protection is put forward and its protection range is not relational to short circuit type, phase or connection mode. The validity of the protection is shown in an example. Adaptive overcurrent protection is initiated and its active current is regulated automatically according to parallel lines operation state. The sensitivity of overcurrent protection is enhanced and this adaptive method is easy to be applied.